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https://issues.apache.org/jira/browse/TEZ-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476635#comment-16476635
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TezQA commented on TEZ-3936:
----------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12923569/TEZ-3936.002.patch
against master revision 1ae6242.
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 3.0.1) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-TEZ-Build/2802//testReport/
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/2802//console
This message is automatically generated.
> Reduce TezEvent messaging overhead
> ----------------------------------
>
> Key: TEZ-3936
> URL: https://issues.apache.org/jira/browse/TEZ-3936
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Priority: Major
> Attachments: TEZ-3936.001.patch, TEZ-3936.002.patch
>
>
> Revisiting TEZ-3145, and found that in addition to improving the way empty
> partitions are send from Maps to AM and AM to Reducers, message serialization
> can be improved to reduce network traffic.
> For example in a job with 42000 Maps and 7500 reduces where 95% of the
> partition data produced is empty. Tez DME events send from the AM to the
> Reducers is num(Maps) * num(Reducers) * size (Wrapped DME). With 95% empty
> partitions message size is 450 bytes where 260 bytes is needed for sending
> empty partitions and 190 bytes for messaging. Total messaging is 132 GBs
> 76 GBs for empty partition data and 56 GBs for non-empty partition messaging.
> This jira aims to reduce the non-empty partition messaging.
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